/Engine/Source/Runtime/Core/Public/UObject/ScriptDelegates.h
Adds a function delegate to this multi-cast delegate's invocation list
void Add ( const [TScriptDelegate](API\Runtime\Core\UObject\TScriptDelegate)< [ThreadSafetyMode](API\Runtime\Core\UObject\TMulticastScriptDelegate\ThreadSafetyMode) > & InDelegate )